Paper-cutting machine.



PATENTED JUNE 2, 1908. T. 0. DEXTER; PAPER cumne MACHINE.

APPLICATION FILED JULY 31. 1907.

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No. 889,213. j PATENTBD JUNE 2, 1908. T. c. DEXTER. PAPER CUTTINGMACHINE.

AIPLIOATIOK FILED JULY 31. 1907.

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No. 889,213; a 4 PATENTED JUNE 2, 1908.

T. G. DEXTER.

, PAPBR'CUTTING MACHINE.

APPLICATION FILED JULY 31. 1907- 4 snng'rs-snnnr a.

TALBOT O. DEXTER, OF PEARL RIVER, NEW YORK.

PAPER-CUTTING- MACHINE.

Specification of Letters Patent.

Patented June 2,1908.

Application filed July 31, 1907. Serial N02 386,318.

To all whom it may concern:

Be it known that I, TALBOT C. DEXTER, a citizen of the-United States,residing at Pearl River, in the county of Rockland, State of New York,have invented certain new and useful Improvements in Paper-CuttingMachines, of which the following is a specification.

In thelong line of improvements in the art of paper cutting machinery,it will be found that the great majority of inventions have aimed at theimprovement of the operating mechanism for the paper holding clamp ;-theknife and its operating mechanism remaining substantially the same asdevised by the earliest inventors in this line. Many importantimprovements have been made in an eflort to perfect the operation of thepaper holding clamp, and most of these improvements have been devisedwith the purpose of producing machines with automatic clamps which willsimulate as near as possible what is known as the hand clamp principle,which is recognized by all manufacturers as the most effective mechanismthat has ever been produced for clamping a pile of paper in a cuttingmachine. Hand clamp machines are almost invariably built upon the screwprinciple for the reason that the screw gives ample power for theapplication of the requisite pressure to the clamp without requiring toomuch manual exertion, and at the same time affords a convenient meansfor manipulating the clamp. The efficiency of the hand clamp mechanismoperating on the screw principle is due, not only to the amount ofpressure exerted, but to the manner in which the pressure isapplied,that is, the positiveness with which an absolutely fixedpressure is secured and held until the knife has passed through the pileof paper. Such positive and effective action cannot be obtained with anyother form of clamp operating mechanism. In hand clamp machines, theclamp is mounted independently of the knife, and is, therefore, operatedseparately and is entirely free from the objection able influence of thevibrations of the knife as it passes through the paper. This is afurther great advantage of the hand clamp machines.

The one objection to the use of the old hand clamp mechanisms is theslowness of operation causing a waste of time and an in crease in theexpense of the paper cutting operation.

Recognizing the value of the screw clamp principle, I have produced anautomatic clamp paper cutting machine which embodies the screw clampaction of the old form of hand clamp machine, and the rapidity ofoperation of automatic clamp machines, which is required for modernpaper cutting machinery. In producing such a machine, I have arrangedmeans for automatically and quickly lowering and raising the clamp intoand out of engagement with a pile of sheets, and suitable screwmechanism, actuated by supplemental means, for imparting a clampingpressure to the clamp after it has engaged the pile, and for releasingthe clamping pressure after the completion of the cutting stroke of theknife. This improved construction possesses all of the advantages andefliciency of the old hand clamp principle, and at the same timeobviates the objectionable slowness of operation of the old forms of machines.

In practically carrying my invention out I prefer to adopt a form ofmachine in which the knife and clamp move into and out of engagementwith the pile simultaneously,

the power forthesc up and down movements beingapplied to the knife, butI donot limit myself to this form of machine. In this form of machinethe connection between the knife and clamp is usually effected throughmeans of diagonal slots formed in one member engaged by pins or lugsprojecting from the face of the other member, so that while the twomembers move simultaneously up or down for part of the stroke, theengagement of the clamp with the pile causes relative movement bothvertically and transversely, effecting the shearing action of the knifeduring the cutting operation. Cutting machines having the simultaneouslyoperating knife and clamp of this form are very old. In my new machine Imay employ this movement, so far as the clamp is concerned, solely forthe purpose of moving the clamp into and out of engagement with thepile, so as to obtain quick action and avoid. the slow and tediousoperation of thescrew action in the old forms of hand clamp machines,and in some automatic clamp machines in which screws are employed forcarrying the clamp through its entire movements. The clamp may, however, be moved into and out of engagement with the pile by othermeansindependently of the knife without departing from the spirit of myinvention.

To permit the free movement of the clamp action.

downwardly and upwardly with the knife, and at the same time provide forscrew clamp action, I have arranged the nuts in which the screws operatein sockets formed in the cross-head of the machine frame, and haveprovided rack and pawl connections between the cross-head and nuts. Thenuts are preferably formed with rack bars upon their projecting faces,and the pawls or dogs are journaled in recesses formed in the heavy Wallof the cross-head. In addition to these detachable connections betweenthe nuts and crosshead, I provide automatic means for o erating thepawls or dogs so that during t 1e main parts of the up and downmovements of the clamp with the knife, the nuts can remain disconnectedfrom the crosshead and will move freely with the screws and clamp, butimmediately after the clamp bar has reached the pile of paper, saidautomatic means actuate the pawls or dogs and cause them to rigidly lockthe nuts in posi tion upon the cross-head preparatory to the action ofthe screws which impart the final clamping pressure upon the clam 3.

In this type of machine it will be understood that the moment the clamptouches the pile of paper in the clamping operation,-

the continued movement of the knife will cause its lateral or shearingaction. Taking advantage of this transverse movement of the knife withreference to the clamp, I have devised a simple form of mechanism forimparting the clamping motion to the screws. The clamp-actuating screwsare freely journaled at their lower ends upon the clamp bar and threadedthrough the nuts and have sliding spline connection with gears of asuitable train actuated by a transversely movable rack bar connectedthrough suitable mechanism with the knife. The result of thisarrangement will be the operation of the screws for applying the finalclamping pressure the moment that the knife starts to move transverselyrelatively to the clamp. This screw operating mechanism is so ar rangedthat a pressure of the required degree will be exerted and the operatingmechanism then be automatically thrown out of This automatic release ofthe operating mechanism may be either by an automatic trip forpositively disconnecting the parts, or by means of suitable slipfriction mechanism having the capacity for holding up to a certainnumber of pounds of pressure. I prefer to operate the pawls which clampthe nuts uponthe cross-head by the same mechanism which actuates thescrews, so that said nuts will be rigidly held the moment the screwsbegin to operate.

In order that my invention may be fully understood, I will firstdescribe the same with reference to the accompanying drawings andafterwards point out the novelty more particularly in the annexedclaims.

In said drawings Figure 1 is a front elevation of a paper cuttingmachine embodying my invention. Fig. 2 is a side elevation of the same.Fig. 3 is a plan view of the same. Figs. 1 and 5 are enlarged detailvertical longitudinal sectional views of the machine taken respectivelyon the section lines 4-4 and 55 of Figs. 1 and Figs. 6 and 7 arerespectively a detail side elevation and a detail plan view of amodified form of part of the mechanism for actuating the clamp screws.

As best suited for the purpose of illustrating my invention, I haveshown it applied to the form of paper cutting machine in which thecutting member and clamping member are mounted to move toward and awayfrom the pile of paper together under the influence of suitableoperating mechanism acting upon the cutting member. In this type ofmachine the cutting member is arranged for longitudinal movement, inaddition to its vertical movements, and the clamping member is confinedin vertical guides so as to permit its vertical movements and preventmovement longitudinally, inclined slots in one of said members engagingpins carried by the other of said members to cause the cutting member tomove in the direction of its length to effect a shearing cut when theclamping member engages and clamps the pile and the cutting member isforced through the paper. This general type of machine is very old inthe art and is illustrated, for example, in the expired patent ofCharles Montague No. 98,611, dated January 4th, 1870. The illustrationof my invention as applied to this type of machine has been adopted byme as the simplest form of mechanism for practically carrying out myinvention, but I would have it understood at the outset that I do notintend to limit my invention to its application to a machine of thisparticular type, since my improvement may readily be applied to otherforms of paper cutting machines without departing from the spirit andscope of my invention, such, for instance, as those machines which haveno direct connection between the cutting member and clamping member.

In the drawings 1, 2, represent the uprightside frames or standards,firmly braced and connected by suitable tie rods or frames and by thetop rail or cross-head 3, the center rail 4 and the paper supportingtable or plat form 5. This framework may be of any desirableconstruction best adapted for the pur pose of supporting the operativeparts of the machine, but must be of heavy construction to properlywithstand the strains to which the machine is subjected in operation.

6 is the knife bar and 7 is the cutting knife removably secured to thebar 6. The bar 6 carrying the knife operates in the vertical slots orguide-ways formed in the side frames or standards 1 and 2. The knife bar6 is formed adjacent to its outer ends with the horizontal slots 8 ineach of which engages an antifriction roller 9 journaled upon a pin 10mounted in the yokeshaped draw bar 11. A draw bar 11 is provided at eachside of the machine, the ends of the knife bar 6 projecting through theyokes of the draw bars, and engaging beneath the antifriction rollers 12mounted on the pins 13 in the draw bar.

14 are guides secured to the upright end frames for confining the drawbars 11. To

' the lower end of each draw bar 11 is pivoted one end of the connectingrod 15, the other end of which is pivotally connected to a crank 16,which cranks are securely mounted upon the opposite ends of a crankshaft 17 which has suitable bearings in the side frames 1 and 2, and hasintermittent motion imparted to it by means of the driving shaft 18suitably geared to the crank shaft 17. The driving shaft 18 is provided.with the usual fly-wheel, driving pulleys and a starting clutch by whichthe machine may be thrown into operation and which is arranged to beautomatically thrown out in a manner well understood in this art.

20 is the clamping bar suitably supported and guided between the sideframes 1 and 2 in rear of the knife bar 6. The exact means for mountingand guiding the clamping bar 20 are not shown, but it will be understoodthat the bar may be mounted. in any suitable manner. The clamping bar 20carries upon its forwardly presented face two rigid pins or lugs 21which project into and engage in the inclined slots 22 formed in theknife bar 6. The purpose of this pin and slot engagement between theclamping bar and the knife bar is to cause the clamp bar to travelvertically toward and away from the pile of sheets under the influenceof the positively driven knife bar, and to effect the longitudinalmovement of the knife bar in the frame when the clamp engages the pileso as to produce a draw out. The structure so far as described withreference to the drawings is old and well known.

30 and 31 are the clamp operating screws, each one of which is formedwith a threaded portion and a longitudinal key-way for the purpose whichwill presently appear. These clamp operating screws 30 and 31 arejournaled at their lower ends in suitable bearings 35 rigidly secured tothe clamp bar 20. The bearings 35 may be of any suitable constructionrigidly secured to the clamp bar in any suitable manner so long as theoperating screws 30 and 31 have a free rotary motion upon the clamp bar,and at the same time move Vertically therewith.

The threaded portions of the clamp operating screws 30 and 31 arethreaded through the elongated nuts 40 which preferably have arectangular exterior cross-sectlon and are loosely fitted in squaredrecesses or sockets 41 formed in the top rail or cross-head 3 of themain frame. These elongated nuts 40 are free to move vertically in thesockets -or recesses 41 for the purpose of automatically adjusting theirrelation to the cross-head 3 in the preliminary and final movements ofthe clamping bar and knife bar as they approach and move away from thepile of sheets.

Each elongated nut 40 is formed on its i11- wardly presented face with avertical rack bar 15 which is adapted to be engaged by a pawl or dog 50or 51. Each pawl or dog 50 or 51 is journaled at 52 in a recessors'ocket formed in the top rail 3 or a boss or enlargement thereon, theournal 52 passing through the walls of the journal recess to secure thepawls or dogs in position and further strengthen their mounting. It isnecessary that the pawls or dogs 50 and 51 be very strongly made andsecurely mounted for the reason that the main strain of clamping comesupon these parts. A suitable spring, such as the leaf springs 55 shownengages each of the pawls or dogs 50 and 51 to give the same a normalspring tendency to engage one of the rack bars. Projecting downwardlyfrom the journal 52 of the pawl 50 is a perforated ear or lug 60, andprojecting upwardly from the journal 52 of the pawl 51 is a perforatedear or lug 61. The controlling rod 62 passes through the ears or lugsand 61 transversely of the machine, and is provided with the two tappetcollars 63 and 64 adjustably secured upon the rod 62 in position toengage the ears or lugs 60 and 61 for operating the pawls 50 and 51.

The controlling rod 62 is connected through means hereinafter described,with the knife bar 6, so that when the knife bar is in its normalposition of rest, the controlling rod 62 will be held in its extremeright hand position when looking at the front of the machine, for thepurpose of holding the pawls 50 and 51 disengaged from the rack barsupon the elongated nuts. This connection of the rod 62 with the knifebar 6 also causes the rod to be shifted toward the left in unison withthe movement of the knife bar to the left, for the purpose of permittingthe pawls 50 and 51 to engage the rack bars upon the elongated nuts forholding said nuts in clamping position. When the pawls 50 and 51 aredisengaged from said rack bars, the elongated nuts 40 are free to movevertically in the cross-head or top rail 3 with the clamping screws uponwhich they are mounted. This operation will be more fully explainedafter the description of the mechanism for operating the clamp screws.

Above its threaded portion, each of the clamp operating screws 30 and 31is formed with a longitudinal key-way which passes freely through thehub of a pinion 71, the

pinion hub being formed with. a feather or together.

be understood that each of the screws 30 and 31 is provided with anoperating pinion 71 mounted and operating as explained.

Centrally journaled in the cross-head or top rail 3 is a vertical screwoperating shaft 80 carrying at its upper end a driving gear 81 which isrigidly secured to it. This driving gear 81 rests upon the circular boss82 of the top rail 3, and meshes with and drives the intermediate gears88 and 84 which are journaled upon studs 85 mounted in the bosses 86.These gears 83 and 84 mesh in turn with the driving pinions 71 upon theclamp operating screws.

The vertical driving shaft 80 is provided with a collar 88 which engagesthe under face of the top rail 3 to confine it in its proper verticalposition. Keyed to the lower end of the operating shaft 80 is a drivingpinion 90, which meshes with the rack teeth 91 formed on the forwardface of the bar 92 which extends transversely of the machine and hassuitable bearings at 93 in the upright frame pieces 1 and 2. The bar 92is driven by the movement of the knife bar 6 transversely of the machineby means which will now be explained.

92" is a stop secured to bar 92 and adapted to engage a part of theframe, such as side frame 1, to limit the return movement of the bar andinsure the same extent of operation on the clamping screws whenreleasing as in applying pressure.

95, 95 is a sectional friction box which embraces and frictionallyengages rack bar This friction box is formed of a main channel block 95fitting over the rear face of the bar 92, and two angular blocks 95embracing the forward corners of the bar 92, and the adjusting screws orbolts 95" which pass freely through the block 95 and are threaded intothe sections 95 springs such as 95 encircling the outer ends of thebolts 95 affording spring pressure between the sections of the box andbar 92. The inner faces of the box sections are provided with facing ofleather or other suitable friction material as shown at 95". By thismeans the frictional engagement of the box 95, 95 with the bar 92 may beadjusted to suit 50 the requirement for exerting more or less pressureupon the clamp operating screws.

Projecting from the rear face of the friction box 95*, 95 is a stud 96upon which is journaled the inner end of a connecting rod 97. Theconnecting rod 97 projects outwardly toward the right side of themachine and is formed adjacent to its outer end with a horizontal guideloop 98 in which engages a guide pin 99 projecting from the upperportion of the side frame '2. The extreme outer end of the connectingrod 97 is formed with a bearing socket 100, which is journaled upon astud 101 projecting rearwardly from a block 102 which is formed with avertical bore through it for the reception of the vertical rod 103mounted in the arms of the yoke-shaped bracket 104 secured at 105 to therear face of the end of the knife bar 6. The block 102 slides freely 011the rod 103 so as to permit the free vertical movement of the knife bar6 without interfering with its connections with the rack bar 92, and atthe same time to impart movement transversely of the machine to thefriction box 95, 95 when the knife bar moves relatively to the clamp barin a direction transversely of the machine.

An arm 110 is formed integral with or rigidly secured to the connectingrod 97 and projects over into position to engage the end of thecontrolling rod 62 of the pawls 50 and 51. This connection is suchthatwhen the connection rod 97 is actuated for operating the clamp screws,said controlling rod 62 will be moved in the same direction forreleasing the pawls 50 and 51 to permit them. to engage the rack bars ofthe nuts 40. In place of employing the adjustable connection between theconnecting rod 97 and the rack bar 92 as above described, I can employany other suitable means which will impart a sullicient clamping stroketo the driving shaft and at the same time afford a lost motionconnection topermit of the full stroke of the knife bar in the directionof its length. I do not intend to limit myself to any particularconstruction of such connecting links, and to more clearly illustratethe scope of .this part of my invention I have shown in Figs. 6 and 7 amodified arrangement of such connecting means which may be employed withequal satisfaction.

Referring to Figs. 6 and 7 it will be observed that the connecting rod97 has pivoted to its inner end at 120 a yoke-shaped link 121 carryingin its yoked end a freely journaled antifriction roller 122 which restsupon the upper face of the rack bar 92 just behind a square block or lug123. Adjustably secured to bracket or other suitable support extendingfrom a convenient part of the machine frame is a cam trip block 125formed with a wedge-shaped roller-engaging end 126 and having asupporting plate portion 127 formed with a horizontal slot 128 in whichengages a set screw 129, by which the trip block may be secured in thedesired adjusted position, just above .the rack bar 92. I11 theoperation of the machine with this form of connection it will beobserved that the lonknife bar.

gitudinal movement of the knife bar to the left will cause theconnecting rod 97 to act through the link 121 to cause antifrictionroller 122 to engage the block 123, and by its engagement force the rackbar 92 to the left to impart the clamping action to the clamp screwsthrough the mechanism above described. This movement of rack bar 92 willcontinue until the antifriction roller 122 rides upon the cam portion126 sufficiently to raise the roller 122 above the block 123, when therack bar 92 will remain at rest (clamping pressure having by itsmovement to this point been effected) and the roller will continue itsinward stroke without effect by riding upon the horizontal guide-way 126of the adjustable cam block. In the return movement for this modifiedstructure, the roller will pass freely over the block 123 and drop downin front of the same and engage the auxiliary block or post 130 to drawthe rack bar 92 backward to the right to re lieve the screws of theirclamping pressure. The advantage in this form of connection over thefrictional connection above described, is due to the fact that in thismodified form there is no release of the pressure of the clamp upon thepile of paper until the very last part of the return movement of theknife bar in the direction of its length, at which point the screwpressure is relieved and immediately following the pawls 50 and 51 aredisengaged from the rack bars of the elongated nuts.

With the above description, the operation of my improved machine will beunderstood from, a brief explanation of the relative action of the novelparts. It will be understood that in operating the described type ofpaper cutting machine, the knife bar. and clamp move vertically togethertoward and away from the pile of sheets supported upon the table. In themachine of this type having my improvements applied to it, the machineat rest has its parts in the position shown in the drawings. In thisposition it will be observed that the pawls 50 and 51 are held out ofcontact with the racks upon the elongated nuts 40, so that the nuts arefree to move vertically in the cross-head 3. When the machine is throwninto operation, it being understood that the pile of paper haspreviously been arranged upon the table, the clamping bar will movedownwardly with the knife bar, causing the screws and 31 to move thenuts downwardly in their sockets in the cross-head 3. In this downwardmovement the splined or keyed upper ends of the screws move freelythrough the pinions 71. This described movement continues until theclamp engages the pile and compresses it sumciently to overcome theweight of the clamp and frictional engagement between the clamp and Themoment that the clamp the knife will be to cause the controlling rod 62to be moved to the left, with the result that the pawls 50 and 51 willbe released and permitted to engage the rack bars upon the nuts 40,these nuts being moved downwardly with the clamp'bar and screwsto'proper position preparatory to the final clamping pressure.Simultaneously with the engagement of the pawls with the rack bars, theconnecting rod 97 moving to the left carries with it the rack bar 92,which imparts motion through the pinion 90, shaft 80, gears 81, 85 andpinions 71, to the clamp operating screws. These screws will be rotatedfor imparting a final pressure upon the clamp bar. The amount ofrotation of the screws will depend upon the adjustment of the frictionbox 95, said friction box maintaining its holdupon the rack bar 92 untilthe compression of the paper develops suflicient resistance to overcomethe frictional hold between the friction box and the rack bar. At thismoment the friction box slips upon the rack bar and continues to slidethereon until the completion of the lengthwise movement of the knifewhich is coincident with its cutting action.

When the knife completes its downward stroke, the return movementimmediately commences, with the result that the movement of the knifebar transversely of the machine will reverse the operation of the parts.The clamp being held firmly upon the pile will cause the knife to moveupwardly and in the direction of its length with reference to the clampto reverse the olamping screws and relieve the clamp of its extremeclamping pressure, and consequently remove the strain of engagementbetween the pawls 50 and 51 and the rack bars of the nuts. At thecompletion of the return endwise movement of the knife bar, thecontrolling rod 62 which has moved in unison with the knife bar, willapproach its extreme right hand position, when tappets 63 and 64 willengage the ears or lugs upon the pawls 50 and 51 and positivelydisengage the pawls from the rack bars. This action entirely frees thenuts upon the clamp operating screws and the clamp bar is then free tomove upwardly with the knife bar, it being carried up to its elevatedposition by the engagement of the pins or lugs 21 with the lower ends ofthe inclined slots 22.

There are many advantages resulting from my improved construction. Inthe first place I obtain the advantages due to the application of thescrew action to the clamp operating mechanism, as hereinbefore referredto. The advantages of this screw movement for the clamp are particularlypresent in my machine because of the application of the screw pressurebetween a rigidly supported nut and clamping bar, by reason of which theclamp is absolutely relieved from any objectionable effect from thevibrations ofthe knife as it passes through the pile of paper. Themanner of applying this screw pressure in my machine is of especialimportance in its application to a machine of the type illustrated in mydrawings, in which there is a pin and slot connection between the knifebar and clamp, which type of machine is probably more subject to theobjectionable influence of the vibrations of the knife than any othertype of paper cutting machine. It will be observed that in my machinethere is the same pin and slot connection between the knife bar andclamp as in the old forms of this type of paper cutting machine, but byreason of the automatic means of positively providing a rigid connectionbetween the screw nuts and the cross-head of the machine frame, I amable to so positively secure the clamp in contact with the pile, thatthe vibrations of the knife cannot by any possibility have any effectupon the clamp during the cutting stroke of the knife.

In my improved machine, I not only secure the advantages of the screwprinciple for operating the clamp, as pointed out, but I provide inaddition thereto an automatic clamp paper cutting machine which is sufficiently quick in operation to meet the requirements of modern times.

A further great advantage of my improved construction is due to the factthat the clamp cannot leave the pile of paper on the return stroke ofthe knife until the knife has passed beyond the upper edge of the pile,when the clamp is finally released so that there is no possibility ofdisarranging the pile by the engagement of the knife on its upperstroke.

So far as I am aware I am the first to devise a paper cutting machine inwhich the 'clamp is moved into engagement with the pile of paper andthen given a final clamping pressure by some auxiliary mechanismactuated by the endwise movement of the knife bar. I believe I am alsothe first to devise such a machine in which clamp operating screws areoperated by this endwise movement of the knife bar. I desire to claimthese features broadly and in addition thereto the provision in amachine having a screw oper ated clamp, of nuts which, are movablerelatively to the frame in which they are supported and such a mechanismin combination with automatically controlled means for positivelyengaging and supporting the nuts preparatory to exerting a finalclamping pressure by the operation of the screws. In addition to thesefeatures which I claim to be broadly novel in my improved machine, Idesire to claim the specific structure by which I prefer to practicallycarry out my invention.

In producing a clamp operating mechanism upon the screw principle inaccordance with my invention, it is necessary to provide for the rapidmovement of the clamp into and out of engagement with the paperindependently of the screw action. In the machine shown in my drawings Ihave arranged for this rapid movement of the clamp by movably mountingthe screw nuts in the cross head of the machine and arranging rack barsand pawls for periodically securing the nuts in place when the clampingscrews are actuated. The same result can be ac complished by othermeans, such for instance as by rigidly mounting the nuts in thecross-head and providing relative movement between the screws and theclamp; or by rigidly mounting the screw nuts in the clamp and providingrelative movement between the cross-head and screws; or by permanentlyjournaling the screws in the crosshead and mounting the screw nuts inthe clamp with provision for relative movement. I desire it understoodthat I consider any of these obvious arrangements for accomplishing theresult for which my invention was devised, to be within the scope andspirit of my invention.

hat I claim is:

1. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with clamp operating means actuated by the transverse movement of theknife.

2. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with means for moving the clamp into and out of engagement with thepaper, and auxiliary clamp operating means actuated by the transversemovement of the knife for applying clamping pressure.

3. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with clamp operating screws, and means actuated by the transversemovement of the knife for operating said screws.

4. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with means actuated by the vertical movements of the knife for movingthe clamp into and out of engagement with the paper, and means actuatedby the transverse movement of the knife for imparting clamping pressureto the clamp .upon the pile.

5. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with means for moving the clamp into and out of engagement with thepaper, and screws actuated by the transverse movement of the knife forimparting clamping pressure to the clamp upon the paper.

6. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with means actuated by the vertical movements of the knife for movingthe clamp into and out of engagement with the paper, and screws actuatedby the transverse movement of the knife for imparting clamping pressureto the clamp upon the paper.

7. Ina paper cutting machine, the combination of a verticallyreciprocating trans-' versely movable knife, and a paper holding clamp,with means for moving the clamp into and out of engagement with thepaper, operating screws for compressing the clamp upon the paper, andmeans, including a lost 1110-.

tion connection, actuated by the transverse movement of the knife -foroperating said screws.

8. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with means actuated by the vertical movements of the knife for movingthe clamp into and out of engagement with the paper, operating screwsfor compressing the clamp upon the paper, and means, including a lostmotion connection, actuated by the transverse movement of the knife foroperating said. screws.

9. In a paper cutting machine, the combination of a knife, and a paperholding clamp, with automatically operated means for moving the clampinto and out of engagement with the paper, clamp-operating screws forcompressing the clamp upon the paper, and means for opreating saidscrews.

10. In a paper cutting machine, the combination of a knife, and a paperholding clamp, with means for moving the clamp into and out ofengagement with the pile, clamp compressing screws, nuts operating uponsaid screws, and means for effecting relative rotation between thescrews and nuts for applying pressure to the clamp.

11. In a paper cutting machine, the combination of a suitable machineframe, a knife,

and a paper holding clamp, with the cooperating screw member and nutmember arranged between the frame and the clamp, one of said membershaving adjustable means connecting it with one of said parts, means formoving the clamp into and out of engagement with the paper, and meansfor effecting relative rotation between the screw and nut members.

12. In a paper cutting machine, the combination of a suitable machineframe, a knife, a paper holding clamp, means for moving the clamp intoand out of engagement with the paper, with the cooperating 13. In apaper cutting machine, the com' bination of a suitable machine frame, aknife, and a paper holding clamp, with means for moving the clamp intoand out of engagement with the paper, the cooperating screw member andnut member arranged between the frame and the clamp, said nut memberhaving. adjustable means connecting it with one of said parts, and meansfor effecting relative rotation between the screw and nut members.

14. In a paper cutting machine, the combination of a frame, a knife, anda paper holding clamp, with means formovingthe clamp into and out ofengagement with the paper, a clamp compressing screw, a detachableconnection between said screw and frame, means for operating said screw,and means for actuating Saiddetachable .connection between the frame andscrew.

15. In a paper cutting machine, the combination of a frame, a knife, anda paper holding clamp, with means for moving the clamp into and out ofengagement with the paper, clamp compressing screws, nuts operating uponsaid screws, detachable connections between said nuts and the framemeans for operating said screws, and means for actuating said detachableconnections between the nuts and frame.

16. In a paper cutting machine, the combination of a frame, a verticallyreciprocating transversely movable knife, and .a paper holding clamp,with means for .mov'ing the clamp into and out of engagement with thepaper, a clamp compressing screw, a detachable connection between saidscrew and the frame, means actuated by the transverse movement of theknife for operating said screw, and means actuated by the same movementof the knife for actuating said detachable connection between the frameand screw.

17. In a paper cutting machine, the combination of a frame, a verticallyreciprocating transversely movable knife, and a paper holding clamp,with means for moving the clamp into and out of engagement with thepaper, clamp compressing screws, nuts operating upon said screws,detachable con.

nections between said nuts and the frame, means actuated by thetransverse movement of the knife for operating said screws, and meansactuated by the same movement of the knife for actuating said detachablecon nections between the frame and nuts.

18. In a paper cuttmg machine, the combination of a frame, apapercutting knife, a paper holding clamp, means for moving the clampinto and out of engagement with the paper, clamp-compressing screws,nuts operating upon said screws and movably mounted in the frame, meansfor periodically securing the nuts against movement upon the frame, andmeans for actuating said screws for compressing the clamp.

19. In a paper cutting machine, the combination of a frame having apaper supporting table and a cross-head above the table, a paper cuttingknife, a paper holding clamp, means for moving the clamp into and out ofengagement with the paper, clamp-compressing screws, nuts operating uponsaid screws and mounted in said cross-head to move toward and away fromsaid table, means for automatically securing the nuts against movementon the cross-head, and means for actuating said screws for compressingthe clamp.

20. In a paper cutting machine, the combination of a frame having apaper supporting table and a cross-head above the table, said cross-headbeing formed with nut-receiving recesses or openings, a paper cuttingknife, a paper holding clamp, means for moving the clamp into and out ofengagement with the paper, clamp-compressing screws, nuts operating uponsaid screws and mounted in said recesses or openings of the cross-head.to move toward and away from the table with the screws, means forautomatically securing the nuts against movement upon the crosshead, andmeans for actuating said screws for compressing the clamp.

21. In a paper cutting machine, the combination of a machine frame, apaper cutting knife, and a paper holding clamp, with screw nuts mountedupon the frame and movable vertically thereon, rack bars upon said screwnuts, pawls or dogs mounted upon the frame in operative relation to saidrack bars, means for moving said pawls or dogs into and out ofengagementwith said rack bars, clamp compressing screws operating insaid nuts and upon said clamp, means for actuating said screws, andmeans independent of said screws and. nuts for raising and lowering theclamp.

22. In a paper cutting machine, the combination of a machine frame, apaper cutting knife, and a paper holding clamp, with clamp-compressingscrews, nuts operating upon the screws and movably mounted upon theframe, rack bars upon said screw nuts, pawls or dogs mounted upon theframe in operative relation to said rack bars, means for moving saidpawls or dogs into and out of engagement with said rack bars includingsprings for moving them in one direction and a controlling rod formoving them in the opposite direction, means independent of said screwsand nuts for raising and lowering the clamp, and means for actuatingsaid screws.

23. In a paper cutting machine, the combination of a machine frame, apaper cutting knife, and a paper holding clamp, with clamp compressingscrews, nuts operating upon the screws and movably mounted upon theframe, rack bars upon said screw nuts, pawls or dogs mounted upon theframe in operative relation to said rack bars, springs for moving saidpawls or dogs into engagement with said rack bars, a controlling rodarranged to disengage said pawls or dogs from said rackbars, meansactuated by the knife for operating said controlling rod, meansindependent of the screws and nuts for raising and lowering the clamp,and means for actuating said screws.

24. In a paper cutting machine, the combination of a paper cuttingknife, and a paper holding clamp, with clamp compression screws, alongitudinally movable bar, means for operating said bar, and gearingbetween said bar and said screws.

25. In a paper cutting machine, the combination of a paper cuttingknife, and a paper holding clamp, with clamp compression screws, alongitudinally movable bar actuated by the knife, and gearing betweensaid bar and said screws.

26. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with clamp compression screws, a transversely movable bar actuated bythe transverse movement of the knife, and gearing between said bar andsaid screws.

27 In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with clamp compression screws, a transversely movable bar actuated bythe transverse movement of the knife, rack teeth upon said bar, a gearwheel meshing with said rack teeth, a shaft upon which said gear wheelis mounted, and gearing between said shaft, and said screws.

28. In a paper cutting machine, the combination of a paper cuttingknife, and a paper holding clamp, with clamp compression screws, alongitudinally movable rack-bar, means for actuating said bar, a shaftcarrying a gear meshing with said rack-bar, pinions upon said screws,and gearing between said shaft and said pinions.

29. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with pair of clamp compressing screws, a gear wheel upon a shaft, saidshaft being suitably geared. to said screws for operating them, atransversely movable rackbar meshing with said gear wheel, and meansconnecting said rack-bar with the knife.

30. In a paper cutting machine, the combination of a suitable frame, avertically reciprocating transversely movable knife, and

'or link operatively engaging said bar, means for operating said rod orlink, and means for restricting the extent of action of the rod or linkupon the bar.

32. In a paper cutting machine, the combination of a verticallyreciprocatingItransversely movable knife, and a paper holding clamp,with clamp operating screws, a transversely movable bar, means actuatedby said bar for o erating said screws, a rod or link operative yengaging said bar, means connecting said rod or link with the knife, andmeans for restricting the extent of action of the rod or link upon thebar.

33. In a paper cutting machine, the combination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with clamp operating screws, a transversely movable bar, means actuatedby said bar for operating said screws, a rod or link operativelyengaging said bar, connecting means between said rod or link and theknife arranged to permit relative motion vertically and cause said rodor link to move transversely of the machine with the knife, and meansfor restricting the extent of action of the rod or link upon the bar.

34. In a paper cutting machine, the com-- bination of a verticallyreciprocating transversely movable knife, and a paper holding clamp,with clamp operating screws, a transversely movable bar, means actuatedby said bar for operating said screws, a rod or link operativelyengaging said bar and extending transversely of the machine, a rod orbolt rigidly mounted upon the knife and having vertically slidingengagement with said rod or link, and means for restricting the extentof action of the rod or link upon the bar.

35. In a paper cutting machine, the combination of a machine frame, apaper cutting knife, and a paper holding clamp, with clamp operatingmeans including screws, a transversely movable bar, means actuated bysaid bar for operating the screws, and means, including a lost motionconnection, for operating said bar.

TALBOT C. DEXTER.

